MagnaFlow OEM Grade Federal and EPA compliant direct-fit converter 21-989 keeps the check engine light off with free flowing mandrel bent tubing and corrosion resistant stainless construction. The spun body replicates the OE design so a single laser fusion weld reduces leak risk while the compact low-mass build improves thermal efficiency, installing without cutting or welding.
| Type | OEM Grade direct-fit catalytic converter |
| Emissions | Federal / EPA compliant (not for sale in CA or NY) |
| Material | Stainless steel, spun body, mandrel bent |
| Installation | Bolt-on, no cutting or welding |
| Part Number | 21-989 |
| Quantity | 1 |
Documents: Technical Bulletin (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004 | Chevrolet | Silverado 2500 | Base |
| 2004 | Chevrolet | Silverado 2500 | LS |
| 2004 | Chevrolet | Silverado 2500 | LT |
| 2004 | Chevrolet | Silverado 2500 | WT |
| 2001-2005 | Chevrolet | Silverado 2500 HD | Base |
| 2001-2006 | Chevrolet | Silverado 2500 HD | LS |
| 2001-2006 | Chevrolet | Silverado 2500 HD | LT |
| 2003-2006 | Chevrolet | Silverado 2500 HD | WT |
| 2004 | GMC | Sierra 2500 | Base |
| 2004 | GMC | Sierra 2500 | SLE |
| 2004 | GMC | Sierra 2500 | SLT |
| 2004 | GMC | Sierra 2500 | WT |
| 2002-2005 | GMC | Sierra 2500 HD | Base |
| 2001-2002,2006 | GMC | Sierra 2500 HD | SL |
| 2001-2006 | GMC | Sierra 2500 HD | SLE |
| 2001-2006 | GMC | Sierra 2500 HD | SLT |
| 2003-2006 | GMC | Sierra 2500 HD | WT |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
